docs: fix typo in FilterChainProxy

Author: erie0210

web/src/main/java/org/springframework/security/web/FilterChainProxy.java

@@ -411,7 +411,7 @@ default FilterChain decorate(FilterChain original) {
 
 		/**
 		 * Provide a new {@link FilterChain} that accounts for the provided filters as
-		 * well as teh original filter chain.
+		 * well as the original filter chain.
 		 * @param original the original {@link FilterChain}
 		 * @param filters the security filters
 		 * @return a security-enabled {@link FilterChain} that includes the provided